The principles of lean manufacturing are designed to help companies eliminate waste, optimize production processes, and deliver value to customers. There are several key principles that underlie the lean manufacturing system, including:

1. Value: The first principle of lean manufacturing is to identify and deliver value to customers. This involves understanding what customers want and need and then designing production processes to deliver products that meet those needs.
2. Value stream: The second principle is to identify and map the entire value stream, including all the steps required to deliver value to the customer. This involves understanding the flow of materials, information, and resources through the production process and identifying any areas of waste or inefficiency.
3. Flow: The third principle is to create a smooth flow of work through the production process, reducing delays and interruptions. This involves organizing the production process so that work can move smoothly from one step to the next, without bottlenecks or delays.
4. Pull: The fourth principle is to produce goods based on customer demand, rather than pushing products through the production process. This involves using a pull system, where goods are produced only when they are needed, rather than producing in anticipation of demand.
5. Perfection: The final principle is to continuously improve the production process to eliminate waste and improve efficiency. This involves constantly looking for ways to streamline the production process, reduce costs, and improve quality.

By following these principles, companies can achieve a more efficient, cost-effective, and customer-focused production process. Lean manufacturing has been adopted by many companies around the world and has been shown to be effective in a wide range of industries, from manufacturing to healthcare to service industries.